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Reports <code>synchronized</code> statement lock expressions
that consist of a non-<code>final</code> field reference.
Such statements are unlikely to have useful semantics, as different
threads may acquire different locks even when operating on the same object.
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<p><b>Example:</b></p>
<pre><code>
  private Object o;
  public void foo() {
    synchronized (o) // synchronization on a non-final field
    { }
  }
</code></pre>
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